Tension device for loom shuttles



- Aug. 27, 1935. I. SNOW 2,012,438

TENSION DEVICE FOR LOOM SHUTTLES Filed Jan. 22, 1935 g mww ulumlm INVENTQR.

M 771 555. [SAAC 5/1 0144 @N T /V 5. 6508M BY ATTORNEY,

Patented Aug. 27, 1935 P TEN QFFICE TENSION FOR LOOM SHUTTLES Isa ac Show, Lawrence, Mass, assignor to Draper Corporation, Hopedal e, Mass a corporation of Maine.

assas inate 22, 1935, Serial No. 2,934

Claims. (01. 139 -223 The present invention p er'tains to automatically I threading loom shuttles andhas more particular referenceto tension devicesin such shuttles for tensioning the running filling. a i Shuttles of the type mentioned have been provided with spring clamp tension-devices wherein tension on the running filling is producedby opposed friction plates which-are yieldingly pressedtogether by coiled springs and the like. 'Such de I propose to provide an automatically threading loom shuttle; with aspringclamp tension de vice which'shall be'simple and inexpensive to manufacture and which shall be stronger and more durable than the prior devices of like nature. This desirable result is accomplished by' means of a spring arm fixed to' the-threading block of the shuttle and carrying a friction surface which cooperates with a surface on the lower side of an outwardly and rearwardly extending thread guard. Such a construction-may be devoid of the small, delicate parts found so disadvantageous in prior constructions.

p A further object of the inventionfisto provide a spring clampr tension devicwhih possesses the, desirable features above mentioned and which, in addition, shall be operative to tension the filling only during the first pick after transfer.

The preferred embodiment of the invention is illustrated on the accompanying drawing, of which:

Fig. 1 is a perspective View of the delivery end of a shuttle comprising the said preferred embodiment;

Fig. 2 is an elevational view of the outer end of the threading block detached from the shuttle;

Fig. 3 is a rear elevational view of the same; and

Fig. 4 is a plan View of the shuttle of Fig. 1 showing the position of the filling during the first pick after transfer.

The shuttle shown on the drawing is comprised of the usual body I having means (not shown) for detachably holding the bobbin 2 which is adapted to be automatically ejected upon depletion of the filling supply and replaced by a fresh bobbin.

The shuttle is provided with a threading block having a front wall 3 and a rear wall 4 defining a thread passage 5 which extends longitudinally of the shuttle. A-th'read guardt extends from thefront wall 3 outwardly and rearwardly over the thread passage adjacent the outer end thereof.- The expressions front, rear, outwardly and-the like, are to be applied considering the shuttle to be positioned in a loom in the usual; manner;

When a. fresh bobbin is first transferred to the shuttleth-e filling end 1 extends outwardly therefrom' 'directly over the thread passage. When the shuttle is first started on the first pick after transfer the filling swirls rearwardly and downwardly about a retaining hook I, and also rearwardly and downwardly about the rearward, free end of the thread guard 6, 50 as to enter the thread passage 5. .Thereaftenduring such first pick after transfer, the fillingextends from the bobbinthrough the threadipassage and longitu-' dinally outwardly of the shuttle beneath the thread I guard.- During the "second pick after" by the path which the runnin'g filling assumes during 'the first pick after-transferI-J The other part is comprised of a spring arm 9, preferably of spring steel. This arm is carried by the rear wall of the threading block, and to this end may have its inner end fixed in such wall. The arm v extends longitudinally outwardly and thence forwardly from its inner, fixed end, and is biased into yielding engagement with the aforementioned friction surface on the thread guard.

The free end of the arm 9, where it cooperates 40 with the thread guard, is provided with a friction surface, preferably by enlarging the arm itself to form a friction plate ID as shown. Both the plate and friction surface are in horizontal planes, thereby providing a spring clamp tension which opens rearwardly to receive the running filling as the latter swirls about the thread guard during the first pick after transfer. If desired, the tension may be adjusted by a screw II which is threaded into the rear wall 4 and bears upwardly against the arm 9 intermediate the ends of the latter.

The tension device described is well adapted to providing for tensioning the filling during only the first pick after transfer, and releasing the filling as it passes down into the side eye. To this end, it opens forwardly, and communicates with the side eye through the usual space between the thread guard and the shuttle body. It will be noted that the filling, when fully threaded, extends through the thread passage 5,

thence downwardly and forwardly between guards l2 and I3, and thence out the side eye. It will also be notedthat thepath of the fully threaded filling is spaced away from the'tension device.

The invention as thus disclosed provides a tension device which is simple, extremely sturdy,

and particularly efficient in operation. In addition to its functions as a tension device, the specific construction disclosed serves to prevent the filling from becoming unthreaded by throwing out of the thread passage'wheni the shuttle boxes on its eye end.

Having fully disclosed the preferred" embodi ment of the, invention, Iiclaim:

1 1:..An, automatically. threading loorrr shuttle.

having a side delivery eye, a, threading blockv comprising. front and rear. walls defining a longitudinally extendin thread passage and, a

threadguard extendingv from said front wall.

outwardly and rearwardly over said threadpas-v sage at theouter endthereof, anda first pick tension device. comprised ofa spring arm carriedby said rear walland extending outwardly and forwardly therefrom. into yielding, engagement with the lower surface of saidthreadguard.

2, An automatically, threading, loom shuttle prising, a spring clamp; tension. device engaging;

and: tensioning the filling'when the latter extends throughsaid thread passage and longitudie;

nally. outwardly of theshuttle beneath said thread guard.

3. An. automaticallyv threading: loom shuttle having aside delivery eye, a; threading block comprising front and rear walls defining a 1ongitudinally extending thread passage and a thread guard extending from said front wall outwardly and rearwardly over said thread passage at the outer end thereof, and a first pick tension device comprised of a friction surface on the lower side of said thread guard adjacent the outer end thereof and a spring arm having its inner end fixed to said rear wall and its outer end formed'to constitute a friction plate cooperating with said friction surface, said shuttle also having a tension adjusting screw carried by said rear. wall andbearing against said arm intermediate the ends of the latter.

4'. An. automatically threading loom shuttle having a side delivery eye, a threading block comprising front and rear walls defining a longitudinally. extending thread passage and a thread guard extending from said front wall outwardly and rearwardly over said thread passage at the-outer end thereof, and a spring clamp tension device'for engaging and tensioning the runningfilling only during the first pick after transfer, said tension device being comprised of a frictionsurface on the lower side of said thread guard adjacent the rearward end of the latter,

andv aspringarm having its inner end fixed to said rear wall and itsouterend'formed into a friction plate cooperating with said friction surface, the said plate being spaced away from thepath which the running filling occupies whenit. is fully, threaded into said delivery eye.

5. An. automatically threading loom shuttle having aside delivery eye, a threading block comprisingfront and rear walls defining a longitudinally extending thread passage and a thread guard extending from said front wall outwardly and rearwardly over said thread passage at the outer end thereof, the rearward end of said thread guard being free and having a horiz ontal friction surface on the lower side thereof, and a spring arm having its inner end fixed to said rear wall and its outer end formed into a horizontal friction plate biased by said arm into engagement with said friction surface, said surfaceand plate constituting a spring clamp tension which is open'rearwardly to receive the running filling during the first pick after transfer and which is open forwardly toward said side delivery eye.

' V ISAAC SNOW. 

